Hirschmann RS20 Programming Manual page 50

Sub-Ring (RSR20, RSR30, MACH1000)
Figure 21: Completely configured Sub-Ring Manager
Configure the 2nd Sub-Ring Manager in the same way. If you have
explicitly assigned SRM 1 the SRM mode manager, you configure
SRM 2 as redundant manager. Otherwise, the assignment is
performed automatically via the higher MAC address (see above)
Switch the two Sub-Ring Managers on under "Operation on/off" in
the overview of the Sub-Ring dialog.
Click on "Set" to temporarily save the entry in the configuration.
Select the dialog
Basic Settings:Load/Save.
In the "Save" frame, select "On device" for the location and click on
"Save" to permanently save the configuration in the active configu-
ration.
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4.1 Example configuration
Redundanz L2P
Release 5.0 04/09